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substr() function is used when you want to remove part of the string. It takes three parameters.
See the substr() structure
substr(string,start,length);
First one for mentioning the string,
Second one is for where to start to,
Third one is for how many strings to keep,
<?php
echo substr("Hello world dbestech ",0, 6);
?>
The output is
hello
The above function starts to count the string from the 0th character and keep 6 of them and remove rest of them.